Prestressed structures,serving as key components in bridge and tunnel construction,frequently operate in high or variable humidity environments.To investigate the long-term deformation and prestress loss of prestressed beams under varying environmental humidities,this study employed the DuCOM-COM3 multi-physis and multi-scale finite element program to analyze prestressed concrete structures across differ-ent humidity levels and compared these findings with experimental results.The findings indicated that con-crete beam prestress loss was influenced by environmental humidity;higher humidity reduced long-term de-formation,thereby mitigating prestress loss and long-term deflection in these structures.This suggests that constitutive models based on multi-scale micro-pore structures could capture the micro-deformations within pore structures,enabling the determination of concrete structures'mechanical properties through computa-tions of micro-behavior and moisture transport within the concrete.Comparative experiments and calcula-tions demonstrated that multi-field and multi-scale analysis of concrete structures could assess the effects of changing environments on the long-term performance of prestressed concrete structures.Through analyzing the mechanism of multi-physics and multi-scale analysis of moisture-heat-stress coupling,the paper simula-ted the prestress loss and long-term deflection of prestressed concrete beams under environmental humidity conditions of 40%,60%,and 80%.The relations between environmental humidity and the shrinkage and creep,the long-term deformation,and the prestress loss were obtained.
关键词
预应力损失/大尺寸结构/多场多尺度/环境湿度/收缩-徐变
Key words
prestress loss/large-scale structure/multi-physics and multi-scale/environmental humidity/shrinkage-creep
维普
万方数据